Document number in SD_DOCUMENT_COPY_ONE_STEP

Hi all,

In one scenario,it's used SD_DOCUMENT_COPY_ONE_STEP to create documents .Is there any FM to find the newly created document number ?. See the code below

types: BEGIN OF ty_vbak,
          vbeln TYPE vbeln_va,
          auart TYPE vbak-auart,
          vkorg TYPE vbak-vkorg,
          vtweg TYPE vbak-vtweg,
       END OF ty_vbak.

DATA  :it_vbak TYPE TABLE OF  ty_vbak,
	wa_vbak type ty_vbak.	

SELECT vbeln auart vkorg vtweg FROM vbak
    INTO  TABLE it_vbak WHERE erdat =  sy-datum
                          AND auart IN ( <so doc types>).

LOOP AT it_vbak INTO wa_vbak.
  CASE wa_vbak-auart.
    WHEN gc_so_doc_type_1.
      lv_auarn  = gc_so_doc_type_10.
    WHEN gc_so_doc_type_2.
      lv_auarn  = gc_so_doc_type_20.
  ENDCASE.

    CALL FUNCTION 'SD_DOCUMENT_COPY_ONE_STEP'
      EXPORTING
        i_auarn = lv_auarn
        i_vbeln = wa_vbak-vbeln.

*find newly created doc no of type 10 or 20
    SELECT vbeln
           erdat
           INTO TABLE it_vbeln_new_so
           FROM  vbak
             WHERE auart = lv_auarn  AND
                   erdat = sy-datum. .

ENDLOOP.

Instead of using SELECT query after 'SD_DOCUMENT_COPY_ONE_STEP', is there any FM to get the same as the select is not reccomended inside the LOOP.

Thanks and regards

Jijo